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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f9b4765e7643f72af6056cae7c4e98370afb51746c3d00891a6b2b5f2ed8ee' 
  AND token = '6sWhRvpFu6uspc6thlvl/mJgGVJLXag/RsmhrtEbyIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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