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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0612da8ac1036e86c968d3fd4c2676f4e8f04b1b32f86a7e4ad0172e15406c' 
  AND token = 'Po3j2baYigMFuJJ53dZZE3YtNb8tBUUNUxvYgNv0mbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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