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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fe70624fa7bfc5bf4b56bf22a71c6daa3894e53e9ec74359ccc49b664ca8a7' 
  AND token = 'ocfF9hIu/Cb37HI3jDO7Pf5yQ0QFwPvrcXm4xmqiMu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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