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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95052941d9c422be1dd636b8378ae1c36a229fceccce25170f08c6a588f7eddb' 
  AND token = 'UkgosKA3ITHomWEIxO9UcFhD1FX7NGpKuAbPdKpueTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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