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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ac4d27a945ef536a3c24aa8b4cc37c564e646cfc54894ada8417733ba47c4f' 
  AND token = 'Sa8KWh44spbsGLFnM06Iwr0NO94WlnJZElbckR261Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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