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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4015435d913dad37b92011bd9d10b6a4c80bbac16429e29a45ea96eda2c171b0' 
  AND token = 'rUVoA0WMvgmTEUu6kM6r4DYcdPih7qsBdXwe11ZnC0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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