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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1f5d5711217c7d58b54b4297666fae5fb592a5a11ac7e1ae4126884317b5fc' 
  AND token = 'Tdvt0mqPUO9qy/HIW+aNeh8Q/wh7bD2aA4ZM+qCNe7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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