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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d8b6849e8e282ffcd8943d199595fc3e70be78a2814769e7ef8a2901e93a68' 
  AND token = '0a2MXAl763d81kBEwv1jA3Yn1poBf1fBPM06Nx23RyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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