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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9552ee18c7426b8f0d52be6643ac240f3c74e3bca9761a1243fd4194ecc4510' 
  AND token = '0lM1CZryveZL2gqb1CZwIeELxDnyGPwU1CYCCkSjCks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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