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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00277bd7cc3779d054ec0da5caf7fcb228acf0e72e3a4daa18f0bf02b72f0b72' 
  AND token = 'Zdi9Y5uNnMA7tvob935dFyT8KDBr7Oe44VzoCYs83p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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