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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbebb68a18e9e2d1a2839115d7803968f370bf8834b1cf14e3659e14c22664f4' 
  AND token = 'bMlARdl/hOIiuV5MWrgAMg6NCrtX9/XJkD7sFjPHYsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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