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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7fe1787ca20d6c1ec24fa832ccafa6fd1ce57dd1e1514470dc335ea2ce631f' 
  AND token = 'SBHMsHZOMaFF6ZXkRZqUF310DnaOd5GU8RWs7pQUKtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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