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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64fd05f604fe81cf11cd464a79d6b10bd393c50bf8858a4a9d1c1ac4217855e' 
  AND token = '4EBBbCk02b8wI+EJEYZzQ9U3CmwaI1tY09CfgptiDEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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