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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b4c87c4f631dbbc71f9e46aee614d338c274504ab3d389819b07ceff8708e5' 
  AND token = 'E/HbvadpOeOJdkV6VDB5Vw0EldF8wjSyZE9ui3o+bZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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