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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042010f28a631f3454d539e00fd61cc6ee94165c94b1420ab9d0774b27bd3d47' 
  AND token = '1ehKq/v5uo06d9XqhbG/bUIY/0AOIEYknd9P+Lxi60k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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