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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb3e974e1367733a6b3785b41419f770387ec99c36cba11ab631feeb806f2a5' 
  AND token = 'g5c0IsMdp34gDdiWZuFVSSO9jj+XVYPH0xCCtR6zA3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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