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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cbb55df1b0a23579a5a89ffc3e6d7c38b782c267fe1ed6afb8478ee41bbf80' 
  AND token = 'mABpVULB7/y9cz3Gl33s99oLdttonXtEJLLSZI31TcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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