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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0998302ff1e51a93c3ca62d2ec58e82e8f79e6e8a7ad0d0b9715bc23af4180f' 
  AND token = '9gEQwssogXUcOPwHp9dcLYUUGZiX6dfx3G4ZFP1++M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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