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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730ebad2d4258c9f52e891604b23b85b0b29ac3d431e1cf19d334aa5dcbec27d' 
  AND token = 'eEZ91ZOHbNzoeJp6Gfrq4T27r1xshW4zK56JRa04T+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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