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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e881ae9f99cfd596a39e29bf087b105fa3ad38cc5f92f8eb512389285decec4' 
  AND token = '+wt+62/WdhN+fAgUb4rnP8comsSIs0rUyiekUQO5Umo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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