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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11538a98d4c1babcf7249531f3479311c2541376691178cf3be4a63b7af0b3f0' 
  AND token = '7z9Lc8L1YTHzOTf7xY/iSB+pr/TVKg1KO+eOyzjCMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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