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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763657fdd326ee1b27d9500d4a4104d0e39d903629a47200f7e9d5482c5cdd7c' 
  AND token = 'aLl+Do4ROai1X6eJTAsMY9jjmw+Qi/6nYN2DHRcWq9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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