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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e683081f8f4d81e687e728b9d45125e278d2412af765d8ba3926149322cf77a6' 
  AND token = '4A/oQ1+BSyD3xNWcDnMBJW+f7M0zW0tTAOCWUggifxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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