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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71fe3c4690f84d475b681546cfd56ecd472b826b869f3f7b8cdac380d493ddc' 
  AND token = 'bVFvQbaZvWyWmkKJd5/KDDR918dCM26URxEoOJlv/yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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