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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8bca4241dcdd971a5e2f59e1c5a9293060f3d16700df02a12714d1eb271ba0' 
  AND token = 'dzmtdjA6ek5Tg4wZSJ1hgDhtof4l3bwAo4amFS4S0rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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