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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb34e982727fee1419e1dd033b0d2ef0c2e90062e892d1782c13da91dc07a8c5' 
  AND token = 'DQKbU3f4shutf01cnJEnbwoqp6I+9plwlxmL6M2LQCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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