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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24286f7a70ff6cd419bb71c42324c70752809ce0290672b9e6bd50b59aa2552' 
  AND token = '9lK3KCepv9QZMPysKQb4V1EwmAKHhXNOhfp42ogrMYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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