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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc9a27b38070e971013cc0bdf429905d724f4afef881a381d8692346f0b0144' 
  AND token = 'ZN9dB8W0o9BJyQ74GJJH/DEchdIOHBVml0CfA3IQvkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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