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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2769d1f9b090b6f715fdca64275d4641bdf068771f6f9e3d16bb43a1a5e474a' 
  AND token = 'Ur15kZEXhLLJcG0YreY/x9XWe07xaSkFIs8uspS4gEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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