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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24836e9ad6d4879e81c9c7101199a1045e2f351f40cc3cecf96232a5345694e' 
  AND token = 'nVRnk3dKxh1RADBeQ6ED44P/waRmlFKcXFZq101thps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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