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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26972366913209789f1a41a1b3aaf15de5e3c590609b2635dd9162e28c623f75' 
  AND token = 'e3oSvrqJiNG3vsw4AZa7u0+WbLrwbUJCv8QR26CUZoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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