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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f909d2c4e4b49207890edd898af3d428b6d87bb189a30cee792728b4889f5fd4' 
  AND token = 'u2BOiLcH2tvL79K5dParnJ0AmdfNC8oGE80ixeYnB0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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