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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7e09d765e13f2b0bfcc66575f37ac9fa732dc34220ec09edc709eb1b457998' 
  AND token = '/csYJoZMBIfH0hF8HFZsx3Y+GfZOuYdka8lenNBHesc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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