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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d97566c7cc3fe930e471411fbde40d90491b5a2138e534e2184f55dcace0d4a' 
  AND token = 'CrLwMDbqXW/Hf3lzxL4F+SVsCeQHchr0mVbdB/CPgUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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