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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0a589660f68068460f1dc7e987a76b9d0dc6ea4e60b794443a49b62b135f17' 
  AND token = '35v0qeA6mrb16RXduKfgFRye0tjN8civM2QPS7A2b58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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