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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3ad0fe3ab5f0e034c75edcc6309300a600859118138760f3c4f330bafa6b22' 
  AND token = 'jI2SHdtdH9Ts0GkMrM2p101BAKSbVTPNCeKpUk5eLrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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