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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9f645d5402d40674f009027f4de41824f7a25563140552ac939e4bf9914a29' 
  AND token = 'Pory4S8YrRs5BoFyH/6whxThyrCn4LUEag91GxFcc/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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