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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab171f86260c4d40e4b29d5a948bc4359f4983b36e7991cdaa782fc0dac3cae' 
  AND token = 'doj5E4wJh4dM/XAUd0lyViMarLrB3t/YVi38RtMLsow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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