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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7184eccd7750078607a7a2dbb5c90ae30c94744dfc5225a2404fa40629de65e5' 
  AND token = 'kYPrL17giAdX/2xuGK8BLeQLijL+t7KBA5dZzMw9V2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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