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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5c0b2aa001ef683276e23fee0482359a345d95c20d63c6e1c1d8f12b3ecdac' 
  AND token = 'b+8dI0VckWRxKRmUS2uJmDsG3XPvsEZxaKFGUpbycME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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