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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1523c42231a105ba2f407caf83c7b341bcbb27bd81974f0c0ed7a97e9e641e3a' 
  AND token = 'YCq8AV8VhFQ/XbsK/a7f6YYENic9ciLky5TyYxLg3iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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