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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccffab41bbd247cae4cfc6b0faef66c19c8f14a4e9bb5e01d83e18ce7fa0ca8c' 
  AND token = '9+IAaIQS6Zz3N6CEr9BVLOvqs32Mh4qPAInE49SIwdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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