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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a1d59d5544e33127f325e684e3ee0b243ca29e436246552fefe3b3c2ebf3b0' 
  AND token = 'k4X6jD2lx86l3Jo9KP9NeszDVe0zYrgwgScYU/039XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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