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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dcf8c7c1034df9448b5d13031e0cf852c2ae893127f835629b57951cdc9fde' 
  AND token = 'K/4z/muMT47gGdL8VFScP80rbZviV3fLpM+l9TK87IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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