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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a64517b6d5a0aa02bb28b88a7465c8cffd6ff8d59572f59049c06f95e59885' 
  AND token = '0in4NNQwslXRJtCjMBrvb4RYxhMhCZKpEj/I566Cmc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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