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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7037f2f9c2d2ce3510f3b21292b8073ee6f6b74c8462df20b830507ef189ae' 
  AND token = 'y/0pJwef2fGGeePSjWWWPl8g7xOsOFx6eBLip2a/wB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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