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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bbdaffdf6ef841144a90f9bf3260059710d7a4d3f8031510c46b2021747817' 
  AND token = 'OX/zYEEda5b/3ANUfhu6ZXxiRg/OEuE3rSyE9NoVyb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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