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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f482b061e4d280a8d3935f25af48af66cef3d4ee8265a9ec4eec70e4937666' 
  AND token = 'KHSyW8cugtcYcE/AIEqhAK81R9mJQjoNmNCwkeZhuIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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