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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad625d31c99455e784ddf7b4354495b83aa0709b06dc40823c6e78598ded770e' 
  AND token = 'fCT+Hf3zwrqEdMJ3PHelaghc+a86DoDNJ9ErTD+FUsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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