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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babe887b7aeccd2e40fbe2bfbe3ceec71a3e5338743be684ff6905b5287f3999' 
  AND token = 'g0MyiNiIiiEisAssoNH7hPDhBtOfpoWocZKnLW0wy8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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