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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb634d1a2fcc724f3e9a755ad4e48a363d92d785dfaf5690f09c9913759f106' 
  AND token = 'omMMhKuqBCBli5WPexwMVuKoiTuTWlb8Z9A0xquMOZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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