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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103daae615ab8a4faa4010c9525cf1b7c22217f72193f3f896866c95fe213e70' 
  AND token = 'nBYW3EH5mtEZOZaG9Ip4w7Pkm3cvBylINX8O9DWs8uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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