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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689886069529e6b6f3e53e1012862d535fc11c6a987d7e71de146fadc0af8450' 
  AND token = 'Vpcf4wOTVqVJsh/C2ept8HawDSe8SwllQPwPa/HW1yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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