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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c68253735eea3ad85ab86942ceaf9b1ae8b1d021c5f4c9b2e5c1d5b26375f0' 
  AND token = '5SqRjVs5KHjmvKkObSWKXCCviovA7KOpc4+YpynRMxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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