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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c015cb2daefb57085cacb6e37e22b59e45f9f5fd95d028b4eeeb22a68c0ba1' 
  AND token = '8dP7vITiyHK5AxinI2bJ2dc/g+Y+zzkMyU4S1ha9B5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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