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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2367b0143109b851f96a3fa34e60bff32112ea99540cdd421595aca214d1b6' 
  AND token = 'gO/2VX2KR5vvHpMbl6HgEcSQjtMwhTp1yVw2f64CWOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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