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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13a0a160ced33268cb813225a843f74fc9dce32ef82a142d8d7732893182ac0' 
  AND token = '2z0b74VD8zT4eydLCLwrAVzzAht9Kft/MOquAklSul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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