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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab4e736d1452d10999cdd5d1036173fd6e9428348c68c4e030fc4cb9e0e5b1f' 
  AND token = 'vztcLieNaQxVnUtwxLeq630PK/11/lCjZmv5NCGrYL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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