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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a45ecf4d779da5d36f5f55ec4f416ce5dd48c384489b8f747100435bafb7055' 
  AND token = 'PTGkbfRQN7yLDLVvIngkwGso6xZCC4ue+Uy4Ig8XqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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