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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e76b16c2d5b764159a32c97ec2b17ffab0f3d6fa68c73aca0aff40e760d884b' 
  AND token = 'eAD2U9s/R7aPeT0/WJNfMb/AgKulNwPoR1JGELVQaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}