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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0836e96a42a41adbaf1cf658be99d0dd86ebd7bbff244dd1c7aeabd985a56617' 
  AND token = 'dGt72G709KG71LNgo+uQGFla/NCmMDPSQW6rR+uIjv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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