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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e862d87e70ae217f85aa208fec57f7e9f0ecbfc1b7b14c7748de54dfaa9b6f8e' 
  AND token = 'mJQu5MPY/iQluXycyCExt5+ZyISEQIgG371sJUyMFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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