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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ddc929c585db77203e9dcb6c8f14b63d7f58c4c21b200b483e8c66dad8afbe' 
  AND token = 'FsBzn2rA0H1T2mosaeaz7ZQB74lkQBx0ye2IIzfZLk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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