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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4039c0d400b55999bd98d643e748ac3dceac120e1e269e892b68ce2225402626' 
  AND token = '9iiojuy8hfsfxnGJI6rdB2cLn/WHsAf9g4eg1icVH54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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