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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3279bf5febbb224c4c18ae91e3a472aee6a7cbb13fcfb8a45097a9f9410df6' 
  AND token = 'Zo1hsjZoloa86TIv6wC+SdyKrSLjc1LI0U5lz2II3xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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