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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6710cec304c53560ac51697719afb6bd5acd6e62ff6da4c7a474747446981ff1' 
  AND token = '3AFhZVPXJXG9HFwn/NDxAwBRHy40ueiqRQPb2G5Ir7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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