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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1a2a6ed31bca677140d7cb0d02a0de6158044c7fad3821a5d029029fb30f7a' 
  AND token = 'Cdv2FmxUIszIU0R7Unq353GWMpaXeLtxgRashjWa5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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