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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e0141bf265428418ee42c665b385299f515d7b0db38c061fe8917fe9cd2d6e' 
  AND token = 'nGC2Qr+xv1nIHHZglvvwQNkkWeTWO5yF1O5vGEicF0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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