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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7d33d7a9f69c1ca6afe12e6ea8c45c78872f0688f58eab6b781c699f7336bc' 
  AND token = '/Zg1/LyScE3YSe/JHpehtjxdVD1nnkFetnJ+B/tlA2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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