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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54d16c3e028202867fa93e08dcfea46a10f01cc0cd51598eee4b353a95b7bdb' 
  AND token = 'cvF/pLj4yNV98bKJ4O481xeufdNKnvdRnsWY/lQncSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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