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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c838ff2d4f3e4445498377dfd84a9390da4adb2596e406d2a30c56882f40cda5' 
  AND token = 'CcLshM5B58f++2HP0+kLKGHgL55g26wXTNRbIAuet8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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